Slipper



FIG. 1 is a right front perspective view of a slipper showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for slipper, substantially as shown. 